Edit/delete own posts
Please look at this first then I will give further details.
Ok, I see the issue. You didn't see that the topic and post is Unapproved at the moment. New Registered User is not allowed to edit or delete post if his topic or post is suspected as spam and set as Unapproved. This is made for spam protection. It doesn't allow spammer to edit and find the best content, which will not be tracked as spam and will be auto-published.
If you want to allow new users to edit and delete their Unapproved topic and post you should navigate in Dashboard to Forums > Settings > Tools > Antispam admin page and decrease spam suspecting levels and set "1" the "User is New (under hard spam control) during first X posts" option.
We've already did this, you can test it again.